retroactivity
/ˌrɛtroæk'tɪvɪti/
n. 
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concubine, concupiscence, concupiscent, concupiscible, concur, concurrence, concurrency, concurrent, concurrently, concurring,
相似单词
retro-, retroact, retroaction, retroactive, retroactively, retroactivity, retro-angle, retroauricular, retrobronchial, retrobulbar,